Futon Mattress Full/Double (Clarksburg)

Please read details. This mattress was gifted to me (not on Trash Nothing) a few days ago. The Cover is washed and good working condition. It does have a few, what looks like old food stains (coffee?) on it which did not wash out. The futon mattress is decent quality and ~6" thick. I was told it was like new. However, there were stains on it (unsure what kind of stains - even if you spill water on this kind of mattress it leaves water/stain marks, so it could be as simple as that.). I have treated the stains with stain remover. It really needs a good steam cleaning, which I do not own a machine. The outside cotton fabric doesn't have any rips or tears. Overall, outside the stains, it is in good condition. It does have lots of life left in it. We decided not to use our futon, so I am offering up the mattress.